期刊
JOURNAL OF ENERGY STORAGE
卷 30, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.est.2020.101483
关键词
CoWO4; CoMn2O4; Nanoflake; Composites; Supercapacitors
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Korea Ministry of Education [2016R1D1A1B02009234]
- Ministry of Trade, Industry, and Energy [N0002310]
A simple synthesis method for hybrid transition metal oxides is important for their application in electrode materials. In this present work, we reported one-pot hydrothermal method to synthesize CoWO4/CoMn2O4 nanoflake composites. The prepared CoWO4/CoMn2O4 nanoflakes composite electrodes were comprehensively characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Electrochemical capacitive behaviour of the electrodes fabricated on a nickel foam substrate were evaluated by cyclic voltammetry (CV), galvanostatic charge/discharge cycling (GCD) and electrochemical impedance spectroscopy (EIS) techniques in 3 M KOH aqueous electrolyte solution. The results show that the CoWO4/CoMn2O4 nanoflake composites possess an excellent specific capacitance of 2259.6 F g(-1) at the current density of 2 A g(-1). In addition, the CoWO4/CoMn2O4 nanoflakes show excellent cycling stability (92.6 % capacity retention after 3000 cycles) than CoWO4(78.3%) and CoMn2O4 (85.7%). These attractive results suggest that these CoWO4/CoMn2O4 nanoflake composites have great potential as an electrode material for the next generation of high-performance electrochemical supercapacitors.
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